Filter for dry cleaning liquids



H. L. LINDBLAD FILTER FOR DRY-CLEANING LIQUIDS Filed Feb. 24, 1941 Patented Sept. 12, 1944 UNITED STATES PATENTQFFICE .2,358,238 I FILTER Fonv DRY CLEANING LIQUms Hama L mnablaa, chicago,L 111.,.assignor to Mercury Cleaning Systems, Chicago, Ill., a. cprporation of Illinois Application/February 24,1941, serial No. 380,135

l1o claims.

My invention relates to vfiltering devices and particularly to a lter adapted for use in treating dry cleaning liquids.

One object of myinvention is to provide a filter VYof relatively great capacity, although of small outside dimensions. This result is accomplished by so arranging the support and the filter cloth that the eiective area of the filter cloth lis very greatly increased. This area. is increased ina cylindrical structure by providing a plurality of folds extending inwardly. Thus the extent of the increased area may be governed by the numberof folds provided in the cloth. As a matter of convenience and facility in operation, I provide a reticulated support, shaped to conform to the shape of the filter bagwherebythe filter cloth is caused to lie snugly against the support throughout its area.

Another object offmy invention is to provide l for the injection of the earthy powder used in filters of this type directly into the lter, a quantitybeing taken up by theflow of liquid from the washer into the filter. Thus the powder which is carried in suspension in the liquid cannot reach the clothing being cleaned, since it is filtered out by the filter cloth in the filter. e

Another object is to provide both the inlet and outlet for the lter at the topof the filter tankor container, the inlet being, of course, to the inside of the filter bag and the outlet at the outside of the bag. .By this arrangement I have found that there is better circulation and dispersion of the solids within the body of liquid.

, The invention will be more readily understood by `reference to the. accompanying drawing, in which,

plate II,closedby the hand screws I2. Liquid is delivered from the washer through a pipe I 3 open x located at the top of the tank, sincethis location .appears to'bring' about a betterl circulation-and dispersion ofthe powder throughout the body of The internal arrangement of the filter -includes a; "reticulated support preferably. composed of large-mesh screening, the support being of generally cylindrical form and conforming to the interior dimensions of the tank I3. This support is composed "of arcuate sections I6 and radially V-shaped folded sections I'I. yThe otherwise open' tops of the V-shaped sections are closed by wedge shaped pieces I8 that may be welded or otherwise secured inplace. These pieces maybe solid or reticulated, as desired. At the bottom the spaces between the V'shaped sections are closed byr wedge shaped'sections I9 of reticulatedmaterial,

thus elevating the support above the bottom wall of the tank to enable thepassage of liquid across the bottom. The support is thus a unitary rigid' structure that may be handled, placed in and removed from the tank without difficulty. At the upper end, a splitringV 20 of square cross-section is used to hold the supportin its seated position.

Thev textile material acting as the filter element is composed of filtercloth and formed as a bag.

This structure, as best shown in Fig. 5, is likewise composed of arcuate' side walls 2I having inwardly f extending folds 22shaped to conform tov andlie insideL of the V,shaped portions of the support, as best shown in Fig. 3. At the bottom,'the space between adjacent folds is closed by sections 23 and at the top'the spaces over the folds are closed by sections 24. The sections 23 and 24 are both preferably composed of the same material as that composing the filter-bag.V These sections 24 overlie the wedge shaped pieces I8. At the top the bag is provided with a continuous strip 25 having a bead 26, used for effecting a seal between'the 4o bag and the inside wall of the tank. as best shown to the upper end of the tank and in this pipe I interpose a container -Il acting as an injector for the powdered earth used in the treatment of the liquid'. A quantity of the powder is placed in the container and is` taken up by theifiow of liquid therethrough.

The tank also provides an outlet pipe VI 5, also in Fig. 2.: A round, split ring 21is employed as the clamping element.y

It will be understood that while in Figs. 4and 5 I have shown sections I8 and 24, and I9' and 23, in

only one instance they will occur at the top and bottom of each'of the folds.

On the bottom wall of thebag at the center thereof I provide a sleeve 28 adapted to be clamped around the lower end 29y of a rod or pipe which extends upwardly at the axis of the tank and is centered and held insubstantially centered positionyby the inwardly projecting! folds of the support "and fabric.' The use of this device acts to insure thecenterfig of and proper location of the 'filter bag at .the bottom.

4the bottom, a filter tank at the top,

.The structure as described wiii be found highly emcient in operation, the filter bag may be quickly removed and replaced as required and templates the use of a-greater or less number,

of folds as desired. It will be understood also that the particular means shown for elevatingthe structureV above the bottom wall of the tank f vmay be replaced by other and different struc` .l tures. These and other modifications should be considered to be within the scope of the appended claims.

1. In a.' filter for liquids, the combination of a tank, a reticulated support within said tank for a filter 7cloth bag, said support being of generally` cylindrical form having a plurality of inbottom for permitting passage of liquid across cloth bag on'said support having sections closing the bag between adjacent folds at the bottom and sections overlying the folds at the top, and means providing an inlet into the space within the filter bag and an outlet from the space in the tank outside of said bag.

2. In a fllter'for liquids, the combination. of a tank,a reticulated support within said tank for a filter cloth bag, said support being of generally cylindrical form having a.' plurality of inwardly projecting folds Iand having means at the bottom for permitting passage of liquid across the bottom,4 means for connecting the folds across their tops, ,a fllter cloth bag on said support having sections vclosing the bag between adjacentfolds at the bottom and vsections overlying the folds at the top, and means providing an inlet into the space within the filter bag andl an outlet from the,l space in the tank outside of said bag.

3. In a filter for liquids, the combination of a tank, ,a reticulated support within said tank for a filter cloth bag, said s llDprt `being of gener' ally cylindrical form having a plurality of inwardly projecting folds and having means at the bottom for permitting passage of liquid across the bottom, a filter cloth bag on said support having sections closing the bagvbetween adjacent folds at the bottom and sections o'verlying the folds at the top, expansible means for clampingthe bag against the inside Wall of the andmeans providing an inlet into space within the filter bag and an outlet from the space in the tank outside of said bag.

4. In a lter for liquids, 'the combination of a tank, a reticulated support within saidtank for a,v filter cloth bag, said support being of generally cylindrical form and having a plurality of inwardly projecting folds, means for connecting the folds across their tops, a filter cloth bag on said support having sections closing the bag be- -tween adjacent folds at the bottom and sections overlying the folds at the top, expansible means for clamping the bag against the inside wall of the tank at the top, and means providing an inlet into'the spacewithin the filter bag and an .wardly projecting folds and having means at the` to beY p i of generauy cylindrical form having 'a plurality closing the top openings in the folds.

6. A'fllter cloth bag adapted for use in a cylindrical tank, comprising a body of cloth of generally cylindrical form having a plurality of radially inwardly positioned folds; means imperforate to solids closing thespaces at the bottom between adjacent folds and overlying and closing the top openings in the folds, and a continuous vertical band or strip connected to the top of the bag and adapted to be clamped against the wall of the tank. 1 7. In a filter for liquids, the combination of a tank, a. reticulated support within said tank for a filter cloth bag, said support being shaped to provide a plurality of radially arranged V-shaped folds between arcuate wall sections, a filtery cloth bag on said support shaped to fit against the in side walls of the supplt and arrangedto filter the liquid flow through the tank, said bag having a centra1 sleeve at its bottom, a rod extending substantially vaxially of the tank having its lower end secured in said sleeve, and means providing an inlet into the spac. within the filter bag and.l an outletfroin outside of said bag.

8. In a filter for liquids, the combination of a tank, a reticulated support within said tank for a filter cloth bag, said support being shaped to provide a plurality of radially arranged V-shaped folds between arcuate wall sections, a filter cloth bag on saidsupport shaped to fit against the inside walls of the support and arranged to filter the liquid flow through the tank, said bag havingia central sleeve at its bottom, a rod extending substantially axially of thetank having its wer end secured in said sleeve, said rod being held in position substantially at the axis of the tank by the inwardly projecting V-shaped folds of the support and bag, and means providing an inlet into thespace within the filter bag and an outlet from the space in the tank outside of said bag.

9. In a filter for liquids, the combination of a tank, a reticulated support within the tank for a filter cloth bag, said support being of generally cylindrical form and having a plurality of iny bag, and conduits for liquid communicating with the space within the filter bag andwith the space in the tank outside of said bag.

y,10. In a filter for cleaning solvents, the, combination 'of acylindrical, vertical tank, a reticulated, support in the form of a rigid unitary structure ofgenerally cylindrical form and having radial folds, a filter bag overlying said support and conforming t0 the folds thereof andv arranged `to filter liquid within ithe tank. and an upstanding rod of the bag and centered substantially axially of the tank by means of the radial folds of the support and bag and serving to flx the position of Y the bottom wall of the bag, said tank having 'a outlet fromth'e space in the tank outside of said' l liquid inlet to the space within the bag and an outlet from the lspace outside of the bag.

Hamannn" Lriisnnmin.4

the space in` the tank secured to thev bottom wall 

